retracer
nounUK /rɪˈtreɪsə/
US /rɪˈtreɪsər/
A retracer is someone who goes back over a path or story to find out exactly what happened.
The retracer followed the old map to find where the treasure was hidden.
OTHER MEANINGS
2. A person who traces a drawing or design again to make a copy.
The artist used a retracer to copy the pattern onto the cloth.
3. A tool or device used to redraw or copy lines accurately.
She used a retracer to copy the map onto a bigger sheet.
4. Someone who recounts or describes an event step by step.
The retracer told the story of the journey from beginning to end.